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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 1651. |
The number of orbitals present in Y shell are |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | 3 |
| Answer» B. 2 | |
| 1652. |
Which of the following pairs are isotopes? |
| A. | Oxygen and ozone |
| B. | Ice and steam |
| C. | Nitric oxide and nitrogen dioxide |
| D. | Hydrogen and deuterium |
| Answer» E. | |
| 1653. |
Principal quantum number determines, |
| A. | Atomic size |
| B. | Orbital angular momentum |
| C. | Shape of the electronic cloud |
| D. | Orientation of orbitals |
| Answer» B. Orbital angular momentum | |
| 1654. |
Three invisible radiations X, Y and Z are passed through an electric field. X goes straight, Y deviates towards the positive end while Z deviates towards the negative end. The particles present in X, Y and Z and the elm ratio for X are e/m ratio for X are |
| A. | X Y Z e/m ratio for X \[\alpha \text{-particles}\] \[\beta \text{-particles}\] \[\gamma \text{-Rays}\] 0 |
| B. | X Y Z e/m ratio for X Neutrons Electrons Protons 0 |
| C. | X Y Z e/m ratio for X \[\alpha -Particles\] \[\beta -Particles\] \[\gamma -Rays\] 1 |
| D. | X Y Z e/m ratio for X Neutrons Electrons Protons 1 |
| Answer» C. X Y Z e/m ratio for X \[\alpha -Particles\] \[\beta -Particles\] \[\gamma -Rays\] 1 | |
| 1655. |
Identify the difference between particles of each given pair.I. \[^{\text{6}}\text{Li}\] and \[^{7}\text{Li}\]II. \[^{\text{32}}\text{S}\] and \[^{\text{32}}{{\text{S}}^{2-}}\]III. \[^{\text{39}}{{\text{K}}^{\text{+}}}\] and \[^{\text{40}}\text{C}{{\text{a}}^{\text{2+}}}\] |
| A. | IIIIIINo. of ProtonsNo. of electronsNo. of Neutrons |
| B. | IIIIIINo. of electronsNo. of ProtonsNo. of neutrons |
| C. | IIIIIINo. of neutronsNo. of electronsNo. of protons |
| D. | IIIIIINo. of protonsNo. of neutronsNo. of electrons |
| Answer» D. IIIIIINo. of protonsNo. of neutronsNo. of electrons | |
| 1656. |
In nature, the element boron occurs 19.9% as \[^{\text{10}}\text{B}\] and 80.1% as\[^{\text{11}}\text{B}\]. If the isotopic mass of \[^{\text{10}}\text{B}\] is 10.013 amu and that of \[^{11}\text{B}\] is 11.009 amu, the atomic mass of boron is |
| A. | 10 |
| B. | 11 |
| C. | 10.8 |
| D. | 11.8 |
| Answer» D. 11.8 | |
| 1657. |
Which fundamental particles are not present in the normal hydrogen? |
| A. | Electron |
| B. | Proton |
| C. | Neutron |
| D. | All of these |
| Answer» D. All of these | |
| 1658. |
Number of moles present in 128 gm of sulphur is |
| A. | 4 |
| B. | 1 |
| C. | 8 |
| D. | 0.5 |
| Answer» E. | |
| 1659. |
In a reaction of chlorine with excess of ammonia, the number of molecules of ammonia required in the balanced equation is |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 8 |
| Answer» E. | |
| 1660. |
When molten form of crystalline solid is rapidly cooled, it changes into |
| A. | Crystalline solid |
| B. | Amorphous solid |
| C. | Insulator |
| D. | Super conductor |
| Answer» D. Super conductor | |
| 1661. |
The mass of magnesium oxide formed by burning 1.216 g magnesium in excess oxygen is |
| A. | 0.416 g |
| B. | 1.616 g |
| C. | 2.016 g |
| D. | 2.816 g |
| Answer» C. 2.016 g | |
| 1662. |
The molar mass of an electron is |
| A. | \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\text{ g}/\text{mol}\] |
| B. | \[\text{5}.\text{486 }\times \text{ 1}{{0}^{-\text{4}}}\text{ g}/\text{mol}\] |
| C. | \[9.108\times {{10}^{-28}}Kg/mol\] |
| D. | \[\text{9}.\text{1}0\text{8 }\times \text{l}{{0}^{-\text{24}}}\text{ g}/\text{mol}\] |
| Answer» C. \[9.108\times {{10}^{-28}}Kg/mol\] | |
| 1663. |
Alum purifies water due to |
| A. | Adsorption |
| B. | Peptisation |
| C. | Coagulation |
| D. | Dialysis |
| Answer» D. Dialysis | |
| 1664. |
Fog is an example of a colloidal system of |
| A. | Liquid dispersed in gas |
| B. | Gas dispersed in gas |
| C. | Solid dispersed in gas |
| D. | Solid dispersed in liquid |
| Answer» B. Gas dispersed in gas | |
| 1665. |
Which one of the following is a pseudo solid? |
| A. | \[Ca{{F}_{2}}\] |
| B. | Glass |
| C. | \[NaCl\] |
| D. | All of these |
| Answer» C. \[NaCl\] | |
| 1666. |
A gas is found to have molecular formula \[(CO)x\] Its V.D. is 70. The value of \[x\] will be |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 1667. |
Two engines each other travelling in opposite directions at 72 km/hr. One engine sounds a whistle of frequency 1088 cps. If the speed of sound is \[340m/\sec \] then frequency heard by the observer on the other engine after crossing will be |
| A. | 9670 Hz |
| B. | 967 Hz |
| C. | 96.7 Hz |
| D. | 9.67 Hz |
| Answer» C. 96.7 Hz | |
| 1668. |
Waves that can not travel in vacuum are |
| A. | X-rays |
| B. | infra sonics |
| C. | ultraviolet |
| D. | radio waves |
| Answer» C. ultraviolet | |
| 1669. |
If a wave of time period T travels with a velocity V, then the wavelength is |
| A. | \[\frac{V}{T}\] |
| B. | \[VT\] |
| C. | \[\frac{1}{VT}\] |
| D. | \[\frac{V}{T}\] |
| Answer» C. \[\frac{1}{VT}\] | |
| 1670. |
The roofs and walls of the auditorium are generally covered with sound absorbent materials to reduce |
| A. | Velocity of sound |
| B. | Reverberation of sound |
| C. | Frequency of sound |
| D. | None of these |
| Answer» C. Frequency of sound | |
| 1671. |
Match the column I with column II and mark the correct option from the codes given below. Column I Column II (a) String vibration (i) Tabia (b) Membrane vibration (ii) Bicycle bell (c) Vibration of air column (iii) Sitar (d) Vibration of plate (iv) Flute |
| A. | (a) - (i), (b) - (iv), (c) - (ii), (d) - (iii) |
| B. | (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii) |
| C. | (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i) |
| D. | (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv) |
| Answer» C. (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i) | |
| 1672. |
The sound takes maximum time to travel from one place to another |
| A. | at night |
| B. | during summer |
| C. | during winter |
| D. | all the time same |
| Answer» D. all the time same | |
| 1673. |
A wave of frequency \[500\,\,Hz\] has a velocity of\[360\,\,m\,\,{{s}^{-1}}\]. Calculate the distance between two points that are \[{{60}^{o}}\] out of phase. |
| A. | \[12\,\,cm\] |
| B. | \[18\,\,cm\] |
| C. | \[24\,\,cm\] |
| D. | \[32\,\,cm\] |
| Answer» B. \[18\,\,cm\] | |
| 1674. |
Which of the following statements about sound waves is correct? |
| A. | Sound waves are not affected by the medium through which it travels. |
| B. | Sound waves travel faster in air than in liquid. |
| C. | Sound waves travel faster in a solid than in liquids and gases. |
| D. | Sound waves cannot travel through a solid. |
| Answer» D. Sound waves cannot travel through a solid. | |
| 1675. |
Pitch of the sound depends upon its |
| A. | wavelength |
| B. | frequency |
| C. | amplitude |
| D. | periodicity and regularity |
| Answer» B. frequency | |
| 1676. |
Mechanical waves having a frequency above the audible range, are called |
| A. | sonic |
| B. | ultrasonics |
| C. | infrasonics |
| D. | supersonics |
| Answer» C. infrasonics | |
| 1677. |
Why do distant sounds such as those of traffic and loudspeakers become Souder during the night time than during the day time? |
| A. | Due to the reflection of sound waves |
| B. | Due to the refraction of sound waves |
| C. | Due to the absence of other sounds |
| D. | Due to a clear perception of hearing |
| Answer» D. Due to a clear perception of hearing | |
| 1678. |
pluck then wire of a sitar, the waves produced in the wire are |
| A. | longitudinal |
| B. | transverse |
| C. | sometimes longitudinal and sometimes transverse |
| D. | electromagnetic |
| Answer» C. sometimes longitudinal and sometimes transverse | |
| 1679. |
When sound waves travel from one medium to another, which of the following physical quantities does NOT alter? |
| A. | Amplitude |
| B. | Velocity |
| C. | Frequency |
| D. | Intensity |
| Answer» D. Intensity | |
| 1680. |
A man fires a shot and hears an echo from a cliff after 2 seconds. He walks 85 m towards the cliff and echo of a second shot is now heard after \[1.5\]second. What is the velocity of sound? |
| A. | 85 m/sec |
| B. | 170 m/sec |
| C. | 340 m/sec |
| D. | 680 m/sec |
| Answer» D. 680 m/sec | |
| 1681. |
A bomb explodes on the moon. How long will it take for the sound to reach the earth? |
| A. | \[10\] seconds |
| B. | \[1000\] seconds |
| C. | \[1\] day |
| D. | It does not reach the earth |
| Answer» E. | |
| 1682. |
The speed of sound waves in an atmosphere of helium at \[0{}^\circ C\] and 1 aim. Pressures is (4g helium under STP has a volume of \[22.4\]liter and \[\lambda =1.67\]for He) |
| A. | 1073 m/sec |
| B. | 973 m/sec |
| C. | 873 m/sec |
| D. | 773 m/sec |
| Answer» C. 873 m/sec | |
| 1683. |
The frequency of a sound wave is \[200\,\,Hz\] and its wavelength is\[150\,\,cm\]. What is the distance travelled by the sound wave in I the time taken to produce \[150\] waves? |
| A. | \[110\,\,cm\] |
| B. | \[225\,\,cm\] |
| C. | \[112.5\,\,cm\] |
| D. | \[336.5\,\,cm\] |
| Answer» D. \[336.5\,\,cm\] | |
| 1684. |
On a slinky, which of the following is produced? |
| A. | A longitudinal wave but not a transverse wave |
| B. | A transverse wave but not a longitudinal wave |
| C. | A longitudinal wave as well as a transverse wave |
| D. | Neither a longitudinal nor5 a transverse wave |
| Answer» D. Neither a longitudinal nor5 a transverse wave | |
| 1685. |
A man standing in front of a large wall claps at a regular frequency of 10 Hz. He finds that the echoes coincide with his clapping. (The speed of sound in air is \[330\text{ }m\text{ }{{s}^{-1}}\].) (i) Time taken between successive clapping is 0.1 s. (ii) The distance between the man and the wall, after he stops clapping, if he hears one more echo is 33 m. (iii) The distance between the man and the wall, after he stops clapping, if he hears four more echoes is 66 m. |
| A. | Only (i) and (ii) are correct. |
| B. | Only (ii) and (iii) are correct. |
| C. | Only (i) and (iii) are correct. |
| D. | All (i), (ii) and (iii) are correct. |
| Answer» D. All (i), (ii) and (iii) are correct. | |
| 1686. |
Direction: Read the passage carefully and answer the following question. Two tuning forks, A and B vibrate with frequencies in the ratio 2 : 7 and their wavelengths in the ratio 3 : 4 respectively. Both the tuning forks are placed in different media. The tuning fork A produces relatively |
| A. | Shrill sound than tuning fork B |
| B. | Flat sound than tuning fork B |
| C. | Louder sound than tuning fork B |
| D. | Sound of more wavelength than that of tuning fork B. |
| Answer» C. Louder sound than tuning fork B | |
| 1687. |
Direction: Read the passage carefully and answer the following question. Two tuning forks, A and B vibrate with frequencies in the ratio 2 : 7 and their wavelengths in the ratio 3 : 4 respectively. Both the tuning forks are placed in different media. Find the tuning fork producing greater velocity of sound. |
| A. | Tuning fork A |
| B. | Tuning fork B |
| C. | Both produce sound of same velocity |
| D. | Cannot say |
| Answer» C. Both produce sound of same velocity | |
| 1688. |
Sound waves cannot pass through |
| A. | a solid-liquid mixture |
| B. | an ideal gas |
| C. | a liquid-gas mixture |
| D. | a perfect vacuum |
| Answer» E. | |
| 1689. |
A stone is dropped from the top of a tower of height\[300\,\,m\]into a pond at the base of the tower. When will the sound of the splash be heard at the top? (Velocity of sound \[=340\,\,m\,\,{{s}^{-1}}\] and\[g=9.8\,\,m\,\,{{s}^{-2}}\]) |
| A. | \[5.6\,\,s\] |
| B. | \[8.7\,\,s\] |
| C. | \[5.4\,\,s\] |
| D. | \[6.7\,\,s\] |
| Answer» C. \[5.4\,\,s\] | |
| 1690. |
The diagram represents two different sound waves. |
| A. | The frequency of X is less than Y and pitch of X is less than Y. |
| B. | The frequency and pitch of X is same as the frequency and pitch of Y. |
| C. | The frequency of X is less than Y but its pitch is same as Y. |
| D. | The frequency of X is same as Y but its pitch is higher than Y. |
| Answer» B. The frequency and pitch of X is same as the frequency and pitch of Y. | |
| 1691. |
Sound travels with a speed of about\[330\text{ }m\text{ }{{s}^{-1}}\]. What is the wavelength of sound whose frequency is 660 Hz? |
| A. | 5 m |
| B. | 50 m |
| C. | 0.5 m |
| D. | 500 m |
| Answer» D. 500 m | |
| 1692. |
Longitudinal wave can travel in |
| A. | solids only |
| B. | liquids only |
| C. | liquids and gases only |
| D. | all media |
| Answer» E. | |
| 1693. |
The hearing ranges of some animals are shown in the given bar graph. Which of the given animals has the ability to hear sounds with the highest pitch? |
| A. | Grasshopper |
| B. | Human |
| C. | Bat |
| D. | Cat |
| Answer» D. Cat | |
| 1694. |
A dog barks in a park and hears its echo after 0.5 second. If the sound of its bark got reflected by a nearby building, find the distance between the dog and the building. Take the speed of sound in air is 346 m/s. |
| A. | 86.5 m |
| B. | 86 m |
| C. | 85 m |
| D. | 75 m |
| Answer» B. 86 m | |
| 1695. |
Statement A: Mechanical Transverse wave can travel through solids & at the surface of liquid only. Statement B: Mechanical Transverse wave can travel through solid, liquid & gases. |
| A. | Both the Statements are True and statement ?I? is correct explanation of Statement 'II'. |
| B. | Both the Statements are True and statement ?I? is not correct explanation of Statement 'II' |
| C. | Statement 'I' is True, Statement 'II' is False. |
| D. | Statement 'I' is False, Statement 'II' is true |
| Answer» E. | |
| 1696. |
Amanda labels some points on the figure of a wave in her physics book. The crest of the wave is marked by which, letter? |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» B. Q | |
| 1697. |
The give figure shows a simple wave. Four points on this wave are labeled as M, N, P, and R. The wavelength of the given wave is the distance between points |
| A. | M and N |
| B. | M and P |
| C. | N and P |
| D. | N and R |
| Answer» E. | |
| 1698. |
The position versus time graph of a particle in a wave is shown in the given figure. The parameter of the wave denoted by a is known as its |
| A. | wavelength |
| B. | amplitude |
| C. | frequency |
| D. | origin |
| Answer» C. frequency | |
| 1699. |
A tuning fork produces 256 waves in 2 seconds. Calculate the frequency of the tuning fork. |
| A. | 1.120 Hz |
| B. | 125 Hz |
| C. | 128 Hz |
| D. | 130 Hz |
| Answer» D. 130 Hz | |
| 1700. |
A man stands in between two cliffs and fires a gun. He hears two successive echoes after 3 seconds and 5 seconds. What is the distance between two cliffs? [speed of sound\[=\text{33}0\text{m}{{\text{s}}^{-\text{1}}}\]] |
| A. | 1320 m |
| B. | 132 m |
| C. | 1333 m |
| D. | 1230 m |
| Answer» B. 132 m | |